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[C++] Static assert on Flatbuffers Version (#7203)

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* Static assert on Flatbuffers Version

* add comment
This commit is contained in:
Derek Bailey
2022-03-31 20:56:41 -07:00
committed by GitHub
parent 59e9713081
commit 0da6f94867
17 changed files with 137 additions and 0 deletions
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25
src/idl_gen_cpp.cpp
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@@ -16,8 +16,10 @@
// independent from idl_parser, since this code is not needed for most clients
#include <string>
#include <unordered_set>
#include "flatbuffers/base.h"
#include "flatbuffers/code_generators.h"
#include "flatbuffers/flatbuffers.h"
#include "flatbuffers/flatc.h"
@@ -199,6 +201,25 @@ class CppGenerator : public BaseGenerator {
for (auto kw = keywords; *kw; kw++) keywords_.insert(*kw);
}
// Adds code to check that the included flatbuffers.h is of the same version
// as the generated code. This check currently looks for exact version match,
// as we would guarantee that they are compatible, but in theory a newer
// version of flatbuffers.h should work with a old code gen if we do proper
// backwards support.
void GenFlatbuffersVersionCheck() {
code_ +=
"// Ensure the included flatbuffers.h is the same version as when this "
"file was";
code_ += "// generated, otherwise it may not be compatible.";
code_ += "static_assert(FLATBUFFERS_VERSION_MAJOR == " +
std::to_string(FLATBUFFERS_VERSION_MAJOR) + " &&";
code_ += " FLATBUFFERS_VERSION_MINOR == " +
std::to_string(FLATBUFFERS_VERSION_MINOR) + " &&";
code_ += " FLATBUFFERS_VERSION_REVISION == " +
std::to_string(FLATBUFFERS_VERSION_REVISION) + ",";
code_ += " \"Non-compatible flatbuffers version included\");";
}
void GenIncludeDependencies() {
int num_includes = 0;
if (opts_.generate_object_based_api) {
@@ -285,6 +306,8 @@ class CppGenerator : public BaseGenerator {
code_ += "#include \"flatbuffers/flatbuffers.h\"";
code_ += "";
GenFlatbuffersVersionCheck();
code_ += "";
SetNameSpace(struct_def.defined_namespace);
auto name = Name(struct_def);
@@ -349,6 +372,8 @@ class CppGenerator : public BaseGenerator {
code_ += "#include \"flatbuffers/flexbuffers.h\"";
}
code_ += "";
GenFlatbuffersVersionCheck();
code_ += "";
if (opts_.include_dependence_headers) { GenIncludeDependencies(); }
GenExtraIncludes();